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AS Questions Wave- Particle Duality: 1. Calculate the energy of a photon that has a wavelength of 720nm. 2. Calculate the momentum of an electron that is moving at a velocity of 2 x 108ms-1 3. Calculate the associate De Broglie wavelength of this electron. 4. What is diffraction? Why does electron diffraction provide evidence for the wave nature of electrons. 5. Neutron diffraction is an important technique in research. Calculate the wavelength of a neutron moving at 0.8c. 6. What is the wavelength associated with a) a 250g cricket ball moving at 100kmh-1? 7. Give one example of a situation in which a) b) c) d) light behaves as if it is made of particles light behaves as a wave electrons behave as particles electrons exhibit wave behaviour